I suggest you ...

IFTTT Support

I've discovered that if you schedule an SMS text to yourself, and include your secret alert keyword to wake up your phone, the text will come in as scheduled, with sound, and a popup. I am using this for important reminders. [I keep SMS sounds off, or it would be dinging all day long.] If IFTTT integration is added, this will be a HUGE feature when combined with the alert keyword.